| Grethe Thordahl | |
| Birth Date: | 11 December 1926 |
| Birth Place: | Ingerselv, Aarhus Municipality, Denmark |
| Death Place: | Denmark |
Grethe Thordahl (11 December 1926 – 29 June 2004)[1] was a Danish stage and film actress. She competed in the Dansk Melodi Grand Prix on 15 February 1964 at the Tivoli Concert Hall, performing the song "Polka i Grand Prix", which she sang with Fredrik but did not place in the top three.